Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
2000-05-05
2001-05-29
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S203000, C430S348000, C430S422000, C430S448000
Reexamination Certificate
active
06238856
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a novel silver halide color photographic material containing at least one color-developing agent and at least one coupler and an image-forming method, and particularly to a silver halide color photographic material excellent in color generation and good in sharpness and preservability of images and an image-forming method.
BACKGROUND OF THE INVENTION
With respect to color photographic materials, the materials are exposed to light, and then subjected to color development, thereby allowing oxidized color-developing agents to react with couplers to form images.
The color development is achieved by immersing the exposed photographic materials in aqueous alkali solutions (developing solutions) in which the color-developing agents are dissolved. However, many problems are encountered, such as easy deterioration of the developing solutions and waste liquid treatment of the spent developing solutions.
As a method for solving these problems, a method of allowing a hydrophilic colloid to contain an aromatic primary amine developing agent or a precursor thereof is proposed. Further, a method of allowing a hydrophilic colloid to contain a sulfonyl hydrazine type developing agent is also proposed. Examples of such methods include methods described in JP-B-58-14671 (the term “JP-B” as used herein means an “examined Japanese patent publication”), and methods described in EP 545,491 A1 and EP 565,165 A1.
However, these methods also suffer from the problem of insufficient color generation in development or pose a problem in storage stability.
Further, in the field of silver halide photographic materials, the so-called color diffusion transfer process in which diffusible dyes are formed imagewise and fixed to image receiving materials, thereby forming color images is a known art. With respect to this process, many proposals have been made. In this process, compounds obtained by making previously colored image formation dyes (preformed dyes) diffusion-resistant (hereinafter referred to as “coloring materials) are generally used. The addition of the coloring materials to layers having silver halide emulsions causes an undesirable reduction in sensitivity to exposure because of the filter effect due to dye portions. As methods for improving these disadvantages, so-called coupling systems in which dye formation is carried out by the coupling reaction of oxidation products of developing agents with couplers are proposed in U.S. Pat. No. 4,469,773 and JP-B-63-36487. However, with regard to the color-developing agents described in these, the storage stability is difficult to be compatible with the activity of the coupling reaction, or it is difficult to make both the color-developing agents and the couplers diffusion-resistant.
For solving the problems described above, novel color-developing agents are proposed in JP-A-08-286340 (the term “JP-A” as used herein means an “unexamined published Japanese patent application”) and JP-A-09-152705. However, in combinations of the color-developing agents and couplers described in these, the color generation of yellow images is insufficient yet, or a problem arises with regard to the hue or color image stability of the yellow images formed.
SUMMARY OF THE INVENTION
An object of the invention is to provide a method for forming a yellow dye from a color-developing agent and a coupler which are both colorless, in which the yellow dye formed therein has excellent sharpness and storage stability.
Another object of the invention is to provide a silver halide color photographic material and an image-forming method, with which sufficient color generation is obtained upon development and color images having excellent image quality are formed.
Other objects and effects of the present invention will become apparent from the following description.
The objects of the invention have been achieved by providing a silver halide color photographic material comprising a support having provided thereon at least one hydrophilic colloidal layer containing at least one color-developing agent represented by general formula (1) and at least one coupler represented by general formula (2):
wherein C&agr; represents a carbon atom, Z represents a carbamoyl group, an acyl group, an alkoxycarbonyl group or an aryloxycarbonyl group, and Q represents an atomic group forming an unsaturated ring together with C&agr;.
wherein C&bgr; represents a carbon atom, EWG represents a cyano group, a carbamoyl group or an alkoxycarbonyl group, LG represents a group which is released by a coupling reaction with an oxidation product of a developing agent, and M represents an atomic group forming a 5-membered aromatic heterocycle together with C&bgr;.
In addition, the objects of the invention have been achieved by providing an image-forming method comprising developing the above-described photographic material, for example, by heat development, by development under alkali generation caused by a slightly soluble metal salt and a complexing agent for the metal salt, or by development with developing an alkali treatment solution.
DETAILED DESCRIPTION OF THE INVENTION
The compounds represented by general formulas (1) and (2), which are used in the invention, are described in detail below
First, general formula (1) is described. In general formula (1), Z represents a carbamoyl group, an acyl group, an alkoxycarbonyl group or an aryloxycarbonyl group. Of these, the carbamoyl group is preferred, and the carbamoyl group having a hydrogen atom bonded to its nitrogen atom is particularly preferred.
The carbamoyl group preferably has 1 to 50 carbon atoms, and more preferably 1 to 40 carbon atoms. Specific examples of such groups include carbamoyl, methylcarbamoyl, ethylcarbamoyl, n-propylcarbamoyl, sec-butylcarbamoyl, n-octylcarbamoyl, cyclohexylcarbamoyl, tert-butylcarbamoyl, dodecylcarbamoyl, 3-dodecyloxypropylcarbamoyl, octadecylcarbamoyl, phenylcarbamoyl, 3-(2,4-di-tert-pentylphenoxy)-propyl-carbamoyl, 4-dodecyloxyphenylcarbamoyl, 2-chloro-5-dodecyloxycarbonylphenylcarbamoyl, naphthylcarbamoyl, 3-pyridylcarbamoyl, 3,5-bisoctyloxycarbonylphenylcarbamoyl, 3,5-bistetradecyloxyphenylcarbamoyl, benzyloxycarbamoyl and 5-dioxo-1-pyrrolidinylcarbamoyl.
The acyl group preferably has 1 to 50 carbon atoms, and more preferably 1 to 40 carbon atoms. Specific examples of such groups include formyl, acetyl, 2-methylpropanoyl, cyclohexylcarbonyl, n-octanoyl, 2-hexyldecanoyl, dodecanoyl, chloroacetyl, trifluoroacetyl, benzoyl, 4-dodecyloxybenzoyl, 2-hydroxymethylbenzoyl and 3-(N-hydroxy-N-methylaminocarbonyl)propanoyl.
The alkoxycarbonyl group and the aryloxycarbonyl group preferably have 2 to 50 carbon atoms, and more preferably 2 to 40 carbon atoms. Specific examples thereof include methoxycarbonyl, ethoxycarbonyl, isobutyloxycarbonyl, cyclo-hexyloxycarbonyl, dodecyloxycarbonyl, benzyloxycarbonyl, phenoxycarbonyl, 4-octyloxyphenoxycarbonyl, 2-hydroxymethyl-phenoxycarbonyl and 4-dodecyloxyphenoxycarbonyl.
Q represents an atomic group forming an unsaturated ring together with C&agr;. The unsaturated ring formed is preferably each of 3- to 8-membered rings, and more preferably a 5- or 6-membered ring. Preferred examples of the rings include benzene, pyridine, pyrazine, pyrimidine, pyridazine, 1,2,4-triazine, 1,3,5-triazine, pyrrole, imidazole, pyrazole, 1,2,3-triazole, 1,2,4-triazole, tetrazole, 1,3,4-thiadiazole, 1,2,4-thiadiazole, 1,3,4-oxadiazole, 1,2,4-oxadiazole, thiazole, oxazole, isothizole, isoxazole and thiophene rings. Further, rings obtained by condensing these rings with each other are also preferably used.
Furthermore, these rings may have substituents, and examples of the substituents include straight-chain, branched-chain or cyclic alkyl groups each having 1 to 50 carbon atoms (for example, trifluoromethyl, methyl, ethyl, propyl, heptafluoropropyl, isopropyl, butyl, t-butyl, t-pentyl, cyclopentyl, cyclohexyl, octyl, 2-ethylhexyl and dodecyl), straight-chain, branched-chain or cyclic alkenyl groups each having 2 to 50 carbon atoms (for example, vinyl, 1-methylviny
Ishiwata Yasuhiro
Katsumata Taiji
Uchida Osamu
Birch & Stewart Kolasch & Birch, LLP
Fuji Photo Film Co. , Ltd.
Le Hoa Van
LandOfFree
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